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Jared Ebert <br /> November 19, 2019 <br /> Page 2 of 2 <br /> 4. Please commit to submitting documentation from the Office of the State Engineer that the <br /> slurry wall(s) have passed the 90-day leak test prior to exposing groundwater and/or beginning <br /> dewatering of the West and East Areas. <br /> Al Response: Aggregate Industries-WCR will not expose ground water that exceeds the <br /> area provided for in the Temporary Substitute Supply Plan or dewater the east or west <br /> cells prior to submitting documentation from the Office of the State Engineer that the <br /> slurry wall(s) have passed the 90-day leak test or providing the Division with an updated <br /> Ground Water Model demonstrating that off-site wells will not be impacted by dewatering <br /> prior to installation of the slurry wall. <br /> Rule 6.4.12— Exhibit L— Reclamation Cost Estimate <br /> 5. The Division has conducted a reclamation cost estimate based on the revised information in <br /> Exhibit L. This estimate is enclosed for your review. The estimated reclamation liability at the <br /> site based on the worst case scenario presented is $3,505,000. The Division included a 20% <br /> contingency cost for the installation of the slurry wall in the East Cell. Please indicate if you <br /> concur with the Division's estimate. <br /> Al Response: Aggregate Industries-WCR, Inc. concurs with the Division's updated cost <br /> estimate. <br /> Please accept this information for review. Thank you for your consideration. Please contact us if <br /> you need additional information to complete your review. <br /> Sincerely, <br /> Christine Felz, Land and Environment Manager <br /> Aggregate Industries-WCR, Inc. <br /> Attachments: <br /> Attachment 1 —Revised Exhibit D <br /> Aggregate Industries—WCR,Inc <br /> 1687 Cole Blvd Suite 300 <br /> Golden,CO 80401 <br />